Protective composition for metal-coating baths



Patented June 26, 1928.

entree stares mates earns-"r errace,

R. MILLRING, OF NEW YORK, N. Y., ASSIGNOR TO AMERICAN MACHINE &

I FOUNDRY COMPANY, A CORPORATION OF 'NEW JERSEY. I

PROTECTIVE COMPOSITION FOR METAL-COATING BATES.

No Drawing Application filed January This invention relatesto that 'methodpf covering metals with a metallic protect1ve coat or envelope, in which the artlcle of metal to be coated is, after being suitably cleansed and fiuxed, immersed in a bath of molten coating metal. In the coating of certain articles, such for instance as metal.

and alloys, firing of the oil may take place,

or the same may rapidly carboniz'e, polymerize, or oxidize, and lose its virtue in protecting the surface of the coating bath.

As a result of experiments and operations carried out under practical conditions I have discovered a protective liquid which is su1t able for protecting thesurface of the metal coating bath against oxidation, where coating metals are. employed requirmg relat1vely high temperatures for their application, such for instanc eas lead coatings and coatings of" alloys of lead containin 16% or less of tin, which protective liqui possesses properties which will prevent its deterioration, as by firing, carbonizing, polymerizing, or oxidation, under the relatively high temperature conditions required, and which by surrounding the rolls between which the coated sheets are passed, will maintain said rolls at the relatively high temperature necessary for their proper functioninfgunder the conditions mentioned. J

In its preferred form, this protective liquid is an oleaginous material, specifically rape seed oil, and may be used alone as a protective covering for the metal bath or.

it may be used in admixture with another ingredient such as a petroleum product, to form an oil mixture possessing the properties and characteristics above mentioned, and the invention, consists of the improved composition of matter consisting of'an oil mixture possessing the above [described characteristics.

9, as. Serial-No. 1,353. E

The protective liquidpossessihg the above mentioned properties, is preferably an oleaginous liquid, and may cons'st of rape seed oil A which possesses a-sutficiently high fire point to prevent firin and also possesses properties which will prevent its deterioration under the working temperature of the coating metal, and this oil will act therefore to protect the surface of the coating bath against oxidation under the temperature conditions described.

In the use of the protective liquid it is placed on the surface .of the metal coating bath so as to surround the usual rolls between which the sheets pass after leaving the bath, the liquid 'by-thussurrounding the rolls acting to maintain them at the requisite high-degree of temperature necessary for the performance of their functions insmoothing down the coatin metal and wringing off the excess thereof.

Instead of rape seed oil alone I may employ the same in admixture with anotheringredient, such as Insulatum A--A, a highly refined petroleum product having a fire point and boiling point in excess of 350 C. and free from tar and from which the unsaturated hydrocarbons have been largely removed, and which has been purified preferably by vacuum distillation, these ingredients to be mixed in the proportions of 98% or thereabout of refined rape seed oil and 2% or thereabout of insulatum. It will be understood that the specific ingredients of this oil mixture may be changed and modified Without departing from the limits of the invention, the essential requirement being that the oil mixture will possess the char acteristics and properties hereinbefore described. The rape seed oil or the above -described oil mixture, according to which ma be employed, will, by surrounding the 120112 between 'which the sheets are entered after their passage through the molten coating bath,'maintain said rolls at the high degree of temperature necessary for them to perform their functions as described, and in addition will enable the rolls to give a finish to the coated sheets, known as an oil finish.

While in the foregoing description I have set forth the use of the protective liquid in connection with amolten bath of lead well for the the surface 0% coating baths of other metals; and may be employed in connection with other forms of apparatus, and for the coating of other forms of metal articles. For instance in the coating of wire with a metal coating, the rolls would be omitted and a layer of sand placed on the surface of the bath together with the protective liquid so that in the passage of the wire through the sand layer, the surplus coating metal would be removed%nd the metal pro erly distributed insmooth condition on t e wire.

the surface of molten metal coating baths against oxidation, which consists of a mixture of rape seed oil and a petroleum prodict possessing a fire point in excess of 350 2. A composition of matter for protecting the surface of molten metal coating baths against oxidation, which consists of a mix ture of rape seed oil and insulatum in proportions substantially as described.

3. A composition of matter for protecting the surface of molten metal coating baths against oxidation, which consists of a mixture of 98% of rape seed oil and 2% of insulatum.

In testimony whereof, I have aflixed my signature hereto.

EDWIN R. MILLRING.

rotection against oxidationof 1. A composition of matter for protecting 2o. 

